Most people are surprised to learn that the second largest energy consumer in the home, after space conditioning, is water heating. Water heating uses more than 15% of the average home's total energy use. Because it is an out-of-sight energy consuming system, most forget about this major contributor to the home's energy bill. For quick savings, this is a great place to start because some minor changes that are fairly easy to make can make a noticeable difference in your energy bills.